In the man there is nothing but maleness. This is not to deny that he may possess the protective instinct and the tender emotion which is its correlate, even though these were undoubtedly feminine in origin. But it is to deny that any injury to, or arrested development of, the male can reveal in him characters distinctively female. He may fail to become a man and may remain a boy; or, having been a man, he may perhaps return, under certain conditions, to a more youthful state; but he will never, can never, display anything distinctive of the woman. Not such, however, must be the woman's case. If anything should interfere with the development and dominance of the femaleness factor in her, there is not another "dose" of femaleness, so to speak, to fall back upon; but a dose of maleness. We may be right in thus seeking to explain certain familiar phenomena, observed in women under various conditions--as, for instance, the growth of hair upon the face in elderly women, the assumption of a masculine voice and aspect, and so forth. Such facts are frequently to be observed after the climacteric or "change of life," which probably denotes the termination of the dominance of the femaleness factor. They are also to be observed as a consequence of operations much more commonly and irresponsibly performed a few years ago than now, which abruptly deprived the organism of the internal secretion through which, as we may surmise, the femaleness factor in the germ makes its presence effective. If these propositions are valid, they are certainly important. Our attitude towards them will depend upon our estimates of the worth of distinctive womanhood. We may regard it as a loss to society that what might have been a woman should become only a sort of man of rather less than average efficiency. Or we may hail with delight the possibility that, after all, we may be able, by judicious education, to make men of our daughters. But, whatever our estimates, certainly it is of great interest to inquire how far and in what directions education may affect the development of what was given in the germ. We cannot yet answer this question. In a thousand matters it is all-important to know in what degree education can control nature, but until we know what the nature of the individual is we cannot decide. Professor Bateson has clearly shown that we shall be able duly to estimate environment only when Mendelian analysis has gone much further, and has instructed us in detail as to the nature of the material upon which environment is to act.